Beak depths in two species of Galapagos Finches, Geospiza fuliginosa and Geospiza fortis, are similar in allopatric populations but have diverged in sympatric populations. This is an example of:

Correct option is C

Character displacement is an evolutionary phenomenon where differences in a specific trait (e.g., beak size) become more pronounced between two species in areas where they coexist (sympatric populations). This occurs to reduce competition for resources. In contrast, in areas where they are geographically separate (allopatric populations), their traits may overlap because the absence of competition does not drive divergence.
· In the case of Galapagos Finches, Geospiza fuliginosa and Geospiza fortis have similar beak depths in allopatric populations (no competition). However, when they coexist (sympatric populations), their beak depths diverge to specialize in different food resources, reducing direct competition.
Key Points: 1. Character Displacement occurs primarily due to niche differentiation.
2. It is a common outcome of sympatric speciation or competition in overlapping ecological zones.
3. Galapagos Finches are a textbook example of this evolutionary adaptation.
4. The divergence is usually in traits directly related to resource use (e.g., feeding structures).
Additional Knowledge: 1. Exploitation (Option 1):
· Refers to an interaction where one organism benefits at the expense of another (e.g., predation, herbivory).
· Not applicable in this context as the interaction is not about consumption but resource partitioning.
2. Semelparity (Option 2):
· Refers to a reproductive strategy where an organism reproduces only once in its lifetime (e.g., salmon).
· Irrelevant to the discussion on beak depth and competition.
3. Character Displacement (Correct Answer):
· A form of adaptive radiation where species evolve distinct traits to minimize competition.
· Promotes coexistence by reducing niche overlap in sympatric populations.
4. Competitive Exclusion (Option 4):
· States that two species competing for the same limiting resource cannot coexist.
· This could result in one species being excluded but does not explain the observed trait divergence in sympatry.